Integrated circuit

ABSTRACT

A base station can prevent deterioration of data channel application control accuracy due to influence of transmission power control to a control channel. In the base station, each encoding section performs encoding processing to an SCCH (Shared Control Channel) of each mobile station, each modulating section performs modulation processing to the encoded SCCH, an arranging section arranges the SCCH to each mobile station to one of a plurality of subcarriers which configure an OFDM symbol, and transmission power control section controls transmission power of the SCCH based on reception quality information reported from each mobile station. The arranging section arranges a plurality of the SCCH to be under transmission power control to one of the subcarriers so that combinations at resource blocks are the same.

CROSS REFERENCE TO RELATED APPLICATIONS

This is a continuation application of application Ser. No. 15/899,045filed Feb. 19, 2018, which is a continuation application of applicationSer. No. 15/289,780 filed Oct. 10, 2016, which is a continuationapplication of application Ser. No. 14/981,252 filed Dec. 28, 2015,which is a continuation application of application Ser. No. 14/705,677filed May 6, 2015, which is a continuation application of applicationSer. No. 14/529,487 filed Oct. 31, 2014, which is a continuationapplication of application Ser. No. 12/377,579 filed Feb. 13, 2009,which is a national stage of PCT/JP2007/066018 filed Aug. 17, 2007,which is based on Japanese Application No. 2006-223583 filed Aug. 18,2006 and Japanese Application No. 2007-104209 filed Apr. 11, 2007, theentire contents of each of which are incorporated by reference herein.

TECHNICAL FIELD

The present invention relates to a radio communication base stationapparatus and a control channel allocation method.

BACKGROUND ART

In recent years, in the field of radio communication, especially inmobile communication, a variety of information such as images and datain addition to speech is transmitted. The demand for higher-speedtransmission is expected to further increase in the future, and, toperform high-speed transmission, a radio transmission techniques thatutilizes limited frequency resources more effectively and achieves hightransmission efficiency is in demand.

OFDM (Orthogonal Frequency Division Multiplexing) is one of radiotransmission techniques, for meeting these demands. OFDM is one ofmulticarrier communication techniques, whereby data is transmitted inparallel using a large number of subcarriers, and it is known that OFDMhas features providing high frequency efficiency and reducinginter-symbol interference under a multipath environment and is effectiveto improve transmission efficiency.

Studies are being conducted for performing frequency schedulingtransmission and frequency diversity transmission using this OFDM on thedownlink, when data for a plurality of radio communication mobilestation apparatuses (hereinafter simply “mobile stations”) isfrequency-domain-multiplexed on a plurality of subcarriers (seeNon-Patent Document 1, for example).

In frequency scheduling transmission, a radio communication base stationapparatus (hereinafter simply “base station”) adaptively allocatessubcarriers for mobile stations, based on the received quality of eachfrequency band in each mobile station, so that it is possible to obtaina maximum multi-user diversity effect. On the other hand, frequencyscheduling is normally performed for each subband, which groups acertain number of neighboring subcarriers into a block, and therefore,not much frequency diversity effect is obtained.

In Non-Patent Document 1, the channel for performing frequencyscheduling transmission is referred to as a “localized channel(hereinafter, the “Lch”). The Lch is allocated in subband units or inunits of a plurality of consecutive subcarriers. Further, the Lch may bereferred to as a “localized resource block (hereinafter, the “L-RB”).”

Non-Patent Document 1 shows an example of dividing one frame (tenmilliseconds) into twenty subframes (one subframe=0.5 milliseconds) andincluding six or seven OFDM symbols in one subframe.

By contrast with this, in frequency diversity transmission, data formobile stations is allocated to the subcarriers in a distributed mannerover the entire band, so that a high frequency diversity effect can beobtained. On the other hand, frequency diversity transmission isperformed regardless of received quality for each mobile station, andtherefore multi-user diversity effect such as in the frequencyscheduling transmission cannot be obtained. In Non-patent Document 1,the channel for performing frequency diversity transmission is referredto as a “distributed channel (hereinafter, the “Dch”). Further, the Dchmay be referred to as a “distributed resource block (hereinafter, the“D-RB”).”

Adaptive control including adaptive modulation may be performed for theLchs and the Dchs on a per subframe basis. For example, to achieve therequired error rate, based on received quality information fed back froma mobile station, the base station performs adaptive control for themodulation scheme and coding rate (Modulation and Coding scheme:MCS) ofL-ch data and D-ch data.

Upon performing adaptive control, the base station transmits controlinformation on a per subframe basis to the mobile station which is atransmission destination of data in each subframe. Normally, controlinformation is transmitted in SCCHs (Shared Control Channels). Further,control information includes the mobile station ID, RB (Resource Block)numbers, MCS information, and so on. The number of SCCHs in one subframeis the same as the number of mobile stations data is transmitted to inthe subframe. Further, control information in an SCCH is transmitted atthe beginning of each subframe prior to data transmission. Moreover,transmission power control for an SCCH is carried out on a per mobilestation basis. That is, the SCCH for a mobile station located near acell boundary is controlled to high transmission power, and the SCCH fora mobile station located near a center part of a cell is controlled tolow transmission power. By this means, limited power resources areflexibly adjusted between the mobile stations and used effectively.

-   Non-patent Document 1: R1-050604 “Downlink Channelization and    Multiplexing for EUTRA” 3GPP TSG RAN WG1 Ad Hoc on LTE, Sophia    Antipolis, France, 20-21 Jun. 2005

DISCLOSURE OF INVENTION Problems to be Solved by the Invention

When frequency scheduling transmission and frequency diversitytransmission are performed, the mobile stations transmitted data fromthe base station vary on a per subframe basis, and therefore thetransmission power for the SCCHs of mobile stations vary on a persubframe basis. Further, in an inter-base station non-synchronizationsystem, where transmission timings are different between base stations,the SCCHs interfere with data channels in neighboring cells. That is, iftransmission power for the SCCH varies per subframe, interference thatthe data channels receives from the SCCH also varies on a per subframebasis.

Here, frequency scheduling and adaptive control for data channels areperformed based on received quality measured in the past subframes, andso, if interference that data channels receive from the SCCHs variesevery subframe and changes the received quality of data channels on aper subframe basis, adaptive control using current and accurate receivedquality information cannot be performed upon data transmission. That is,the accuracy of adaptive control is degraded. As a result, datathroughput decreases.

It is therefore an object of the present invention to provide abasestation and control channel allocation method for preventing theaccuracy of adaptive control from degrading.

Means for Solving the Problem

The base station of the present invention adopts a configurationincluding: an allocating section that allocates a plurality of controlchannels to a plurality of subcarriers such that a combination of theplurality of control channels is the same between a plurality ofresource blocks; a generating section that generates a multicarriersignal in which the plurality of control channels are allocated to theplurality of subcarriers; and a transmitting section that transmits themulticarrier signal.

Advantageous Effect of the Invention

According to the present invention, it is possible to preventdegradation of the accuracy of adaptive control.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a block diagram showing the configuration of the base stationaccording to an embodiment of the present invention;

FIG. 2 is SCCH allocation example 1, according to the embodiment of thepresent invention;

FIG. 3 is SCCH allocation example 2 (subframe 1), according to theembodiment of the present invention;

FIG. 4 is SCCH allocation example 2 (subframe 2), according to theembodiment of the present invention;

FIG. 5 is SCCH allocation example 3, according to the embodiment of thepresent invention;

FIG. 6 is SCCH allocation example 4, according to the embodiment of thepresent invention;

FIG. 7 is SCCH allocation example 5, according to the embodiment of thepresent invention;

FIG. 8 is SCCH allocation example 6, according to the embodiment of thepresent invention;

FIG. 9 is SCCH allocation example 7, according to the embodiment of thepresent invention;

FIG. 10 is SCCH allocation example 8 (cell 1), according to theembodiment of the present invention;

FIG. 11 is SCCH allocation example 8 (cell 2), according to theembodiment of the present invention;

FIG. 12 is allocation patterns 1 to 5 in SCCH allocation example 9,according to the embodiment of the present invention;

FIG. 13 is SCCH allocation example 9 (cell 1), according to theembodiment of the present invention;

FIG. 14 is SCCH allocation example 9 (cell 2), according to theembodiment of the present invention;

FIG. 15 is SCCH allocation example 10 (cell 1), according to theembodiment of the present invention;

FIG. 16 is SCCH allocation example 10 (cell 2), according to theembodiment of the present invention;

FIG. 17 is allocation patterns 1 to 5 in SCCH allocation example 11,according to the embodiment of the present invention;

FIG. 18 is SCCH allocation example 11 (cell 2), according to theembodiment of the present invention;

FIG. 19 is SCCH allocation example 12 (cell 1), according to theembodiment of the present invention;

FIG. 20 is SCCH allocation example 12 (cell 2), according to theembodiment of the present invention; and

FIG. 21 is SCCH allocation example 13, according to the embodiment ofthe present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Now, embodiments of the present invention will be described in detailwith reference to the accompanying drawings.

FIG. 1 shows the configuration of base station 100 of the presentembodiment. Base station 100 is used in a mobile communication systemwhere adaptive control for data channels is performed every several RBs(resource blocks).

In base station 100, encoding and modulating sections 101-1 to 101-neach formed with encoding section 11 and modulating section 12 for anSCCH, encoding and modulating sections 104-1 to 104-n each formed withencoding section 21 and modulating section 22 for a data channel, anddemodulating and decoding sections 114-1 to 114-n each formed withdemodulating section 31 and decoding section 32, are provided in thenumber of mobile stations n with which base station 100 can communicate.Further, encoding and modulating sections 101-1 to 101-n, encoding andmodulating sections 104-1 to 104-n, and demodulating and decodingsections 114-1 to 114-n, are provided for mobile stations 1 to n.

In encoding and modulating sections 101-1 to 101-n, encoding sections 11encode control information per mobile station transmitted in the SCCHsper mobile station, and modulating sections 12 modulate controlinformation after encoding, and output the control information toallocating section 102.

Allocating section 102 allocates the control information for the mobilestations to a plurality of subcarriers forming an OFDM symbol, andoutputs the allocated control information to transmission power controlsection 103. That is, allocating section 102 allocates the SCCH for eachmobile station to one of a plurality of subcarriers forming an OFDMsymbol. The allocation process in allocating section 102 will beexplained in detail.

Transmission power control section 103 controls transmission power ofcontrol information based on received quality information reported fromthe mobile stations, and outputs the control information to multiplexingsection 106. At this time, based on received quality information overthe entire band per mobile station, transmission power control section103 controls control information transmission power on a per SCCH basis.Further, transmission power of the SCCHS for each mobile station is setsuch that each mobile station can receive control information insufficient received quality. That is, transmission power control section103 controls transmission power of a plurality of SCCHs individually.

In encoding and modulating sections 104-1 to 104-n, encoding sections 21encode transmission data per mobile station and modulating sections 22modulate the transmission data after encoding, and output the modulatedtransmission data to allocating section 105. The coding rate andmodulation scheme at this time follow MCS information inputted fromadaptive control section 115.

According to the control from adaptive control section 115, allocatingsection 105 allocates data for mobile stations to a plurality ofsubcarriers forming an OFDM symbol, and outputs the allocated data tomultiplexing section 106. At this time, allocating section 105 allocatesdata for mobile stations to a plurality of subcarriers in L-RB units orin D-RB units. Further, allocating section 105 outputs the mobilestation IDs and RB numbers as allocation information for data(information showing which data for which mobile station has beenallocated to which RBs) to control information generating section 116.

Multiplexing section 106 time-domain-multiplexes the data inputted fromallocating section 105 and the control information inputted fromtransmission power control section 103, and outputtime-domain-multiplexed information to IFFT (Inverse Fast FourierTransform) section 107. Control information is multiplexed, for example,every subframe.

IFFT section 107 performs an IFFT on a plurality of subcarriers wherecontrol information and data are allocated, to generate an OFDM symbol,which is a multicarrier signal. That is, IFFT section 107 generates anOFDM symbol where a plurality of SCCHs after transmission power controlis allocated to a plurality of subcarriers.

CP (Cyclic Prefix) addition section 108 adds the same signal as the tailpart of the OFDM symbol, to the beginning of that OFDM symbol, as a CP.

Radio transmitting section 109 performs transmission processingincluding D/A conversion, amplification and up-conversion, on the OFDMsymbol with a CP, and transmits the OFDM symbol with a CP from antenna110 to the mobile stations.

On the other hand, radio receiving section 111 receives via antenna 110maximum n OFDM symbols transmitted at the same time from a maximum of nmobile stations, and performs receiving processing includingdown-conversion and D/A conversion on these OFDM symbols.

CP removing section 112 removes the CPs from the OFDM symbols afterreceiving processing.

FFT (Fast Fourier Transform) section 113 performs an FFT on the OFDMsymbols after the CP removal to obtain mobile station-specific signalsmultiplexed in the frequency domain. Here, the mobile stations transmitsignals using different subcarriers or different subbands, and themobile station-specific signals include received quality informationreported from the mobile stations. Each mobile station is able tomeasure received quality from, for example, the received SNR, receivedSIR, received SINR, received CINR, received power, interference power,bit error rate, throughput, MCS that achieves a predetermined errorrate, and so on. In addition, received quality information may bereferred to as “CQI (Channel Quality Indicator)” or “CSI (Channel StateInformation),” for example.

In demodulating and decoding sections 114-1 to 114-n, demodulatingsections 31 modulate the signal after FFT and, decoding sections 32decode the signal after demodulation, to acquire received data. Receivedquality information in the received data is inputted to transmissionpower control section 103 and adaptive control section 115.

Based on the received quality information reported from the mobilestations, adaptive control section 115 performs adaptive control on thetransmission data for the mobile stations. That is, based on thereceived quality, adaptive control section 115 selects the MCS that canachieve the required error rate for encoding and modulating sections104-1 to 104-n, and outputs the MCS information. This adaptive controlis carried out every L-RB and D-RB. That is, adaptive control section115 performs adaptive control on data channels every several RBs.Further, based on received quality information, adaptive control section115 determines with respect to allocating section 105, to which the RBstransmission data for the mobile stations is allocated, using schedulingalgorithms such as the maximum SIR method and the proportional fairnessmethod. Further, adaptive control section 115 outputs the MCSinformation per mobile station to control information generating section116.

Control information generating section 116 generates control informationper mobile station formed with the allocation information per mobilestation and the MCS information per mobile station, and outputs thegenerated control information to corresponding encoding sections 11.

Next, the allocation process in allocating section 102 will be describedin detail using the following SCCH allocation examples. In all of thefollowing allocation examples, allocating section 102 allocates aplurality of SCCHs subject to transmission power control to a pluralityof subcarriers such that the combination of SCCHs is the same between aplurality of RBs. Further, as described above, adaptive control section115 performs adaptive control for data channels every several RBs.

Furthermore, in all of the following allocation examples, controlinformation transmitted in the SCCHs is time-domain-multiplexed at thebeginning of a subframe. That is, the SCCH for each mobile station isallocated to one of a plurality of subcarriers of an OFDM symbol at thebeginning of a subframe.

Further, in all of the following allocation examples, one subframe isformed with OFDM symbols #1 to #8, the SCCHs are allocated to thesubcarriers in OFDM symbol #1, and the data channels are allocated tothe subcarriers in OFDM symbols #2 to #8. Furthermore, a plurality ofsubcarriers forming an OFDM symbol are divided into a plurality ofsubbands.

SCCH ALLOCATION EXAMPLE 1 FIG. 2

The present allocation example is a case where a data channel in eachsubframe is formed with L-RBs alone. To be more specific, L-RB 1 isformed with subcarriers f₁ to f₃, L-RB 2 is formed with subcarriers f₄to f₆, and L-RB 3 is formed with subcarriers f₇ to f₉.

Assuming that the number of RBs in the communication band is N_RB andthe number of subcarriers forming one SCCH is M, allocation section 102allocates the SCCHs for mobile stations to subcarriers such that one RBincludes M/N_RB SCCHs. This makes it possible to evenly allocate theSCCHs for mobile stations to the RBs. If M does not divide by N_RB, byallocating the SCCHs for mobile stations to the remaining sub carriersin order, it is possible to approximately evenly allocate the SCCHs formobile stations to RBs.

That is, in the RB configuration shown in FIG. 2, allocating section 102allocates SCCH #A for mobile station #A to subcarriers f₁, f₄ and f₇,SCCH #B for mobile station #B to subcarriers f₂, f₅ and f₈, and SCCH #Cfor mobile station #C to subcarriers f₃, f₆ and f₉. By this allocation,the combination of a plurality of SCCHs is the same in all of L-RB 1 toL-RB 3, that is, the combination of SCCH #A, SCCH #B and SCCH #C. Thatis, only if SCCH #A, SCCH #B and SCCH #C have different transmissionpower by transmission power control, the average transmission power perRB equals between L-RB 1, L-RB 2 and L-RB 3.

In this way, by making the combination of SCCHs the same between all ofL-RB 1, L-RB 2 and L-RB 3 and by evenly allocating the SCCHs of mobilestations to RBs, it is possible to minimize the influence ofinterference fluctuation in which the variation of SCCH transmissionpower for one mobile station imposes one RB. Further, transmission powerof the SCCHs for the mobile stations varies independently per subframe,so that, by an averaging effect, the variation of the total amount ofinterference that entire SCCHs give the RBs decreases. Particularly,when the mobile stations where data channels are allocated vary betweensubframes, the amount of variation of SCCH transmission power betweensubframes increases and an averaging effect further increases. That is,according to the present allocation example, in an inter-base stationnon-synchronization system, even when interference that data channelsreceive from SCCHs varies per subframe due to the influence of SCCHtransmission power control, it is possible to prevent degradation ofaccuracy of data channel adaptive control.

Further, transmitting power control section 103 may control thetransmission power of SCCH #A, SCCH #B and SCCH #C individuallymaintaining the total transmission power of SCCH #A, SCCH #B and SCCH #Cis fixed. This can fix the interference power the RBs in neighboringcells receive, regardless of individual SCCH transmission powervariations. That is, it is possible to prevent degradation of theaccuracy of adaptive control in neighboring cells, occurred by influenceof the SCCH transmission power control in one cell.

SCCH ALLOCATION EXAMPLE 2 FIGS. 3 and 4

The present allocation example is a case where a data channel in eachsubframe is formed with D-RBs alone or L-RBs alone, and the D-RBs andL-RBs are time-domain-multiplexed on a per subframe basis. To be morespecific, in subframe 1, as shown in FIG. 3, D-RB 1 is formed withsubcarriers f₁, f₄ and D-RB 2 is formed with subcarriers f₂, f₅ and f₈,and D-RB 3 is formed with subcarriers f₃, f₆ and f₉. Further, insubframe 2, as shown in FIG. 4, L-RB 1 is formed with subcarriers f₁ tof₃, L-RB 2 is formed with subcarriers f₄ to f₆, and L-RB 3 is formedwith subcarriers f₇ to f₉.

In RB configuration as such, as shown in FIGS. 3 and 4, allocatingsection 102 allocates SCCH #A for mobile station #A to subcarriers f₁,f₆ and f₈, SCCH #B for mobile station #B to subcarriers f₂, f₄ and f₉,and SCCH #C for mobile station #C to subcarriers f₃, f₅ and f₇. That is,according to the configuration of D-RBs, allocating section 102cyclically shifts on a per subband basis the allocation pattern of SCCH#A to SCCH #C in each subband, makes the allocation pattern of SCCH #Ato SCCH #C different between the subbands, and allocates SCCH #A to SCCH#C to subcarriers f₁ to f₉.

By adopting such an allocation, even when the SCCH allocation does notchange between subframe 1 formed with D-RBs and subframe 2 formed withL-RBs, the combination of a plurality of SCCHs is the same in all ofD-RB 1 to D-RB 3 in subframe 1 and L-RB 1 to L-RB 3 in subframe 2, thatis, the combination of SCCH #A, SCCH #B and SCCH #C. That is, even in acase where D-RBs and L-RBs are time-domain-multiplexed on a per subframebasis, it is possible to evenly allocate the SCCHs for mobile stationsover a plurality of subframes without changing SCCH allocation.Consequently, even when D-RBs and L-RBs are time-domain-multiplexed on aper subframe basis and interference that data channels receive from theSCCHs varies per subframe due to the influence of SCCH transmissionpower control, it is possible to prevent degradation of accuracy of datachannel adaptive control.

SCCH ALLOCATION EXAMPLE 3 FIG. 5

The present allocation example is a case where D-RBs and L-RBs arefrequency-domain-multiplexed on a per subframe basis and the number ofL-RBs is larger than the number of D-RBs in one subframe. Further, thepresent allocation example is a case where the number of SCCHs (here,three of SCCH #A, SCCH #B and SCCH #C) is the same as the number ofD-RBs in one subband (here, three of D-RB 1, D-RB 2 and D-RB 3).

To be more specific, D-RB 1 is formed with subcarriers f₁, f₁₀ and f₁₉,D-RB 2 is formed with subcarriers f₂, f₁₁ and f₂₀, and D-RB 3 is formedwith subcarriers f₃, f₁₂ and f₂₁, and L-RB 1 is formed with subcarriersf₄ to f₆, L-RB 2 is formed with subcarriers f₇ to f₉, L-RB 3 is formedwith subcarriers f₁₃ to f₁₅, L-RB 4 is formed with subcarriers f₁₆ tof₁₈, L-RB 5 is formed with subcarriers f₂₂ to f₂₄, and L-RB 6 is formedwith subcarriers f₂₅ to f₂₇.

In RB configuration as such, allocating section 102 allocates SCCH #Afor mobile station #A to subcarriers f₁, f₄, f₇, f₁₂, f₁₅, f₁₈, f₂₀, f₂₃and f₂₆, SCCH #B for mobile station #B to subcarriers f₂, f₅, f₈, f₁₀,f₁₃, f₁₆, f₂₁, f₂₄, and f₂₇, and SCCH #C for mobile station #C tosubcarriers f₃, f₆, f₉, f₁₁, f₁₄, f₁₇, f₁₉, f₂₂ and f₂₅. That is,according to the configuration of D-RBs, allocating section 102cyclically shifts the allocation pattern of SCCH #A to SCCH #C in eachsubband in three subband cycles, makes the allocation pattern of SCCH #Ato SCCH #C different in three subband cycles between the subbands, andallocate SCCH #A to SCCH #C to subcarriers f₁ to f₂₇.

By adopting such an allocation, the combination of a plurality of SCCHsis the same in all of D-RB 1 to D-RB 3 and L-RB 1 to L-RB 6, that is,the combination of SCCH #A, SCCH #B and SCCH #C. Consequently, even whenD-RBs and L-RBs are frequency-domain-multiplexed and interference thatdata channels receive from SCCHs varies per subframe due to theinfluence of SCCH transmission power control, it is possible to evenlyallocate the SCCHs for mobile stations to the RBs and preventdegradation of accuracy of data channel adaptive control.

SCCH ALLOCATION EXAMPLE 4 FIG. 6

This allocation example is a case where D-RBs and L-RBs arefrequency-domain-multiplexed on a per subframe basis and the number ofL-RBs is smaller than the number of D-RBs in one subframe. Further, asin allocation example 3, the present allocation example is a case wherethe number of SCCHs (here, three of SCCH #A, SCCH #B and SCCH #C) is thesame as the number of D-RBs in one subband (here, three of D-RB 1, D-RB2 and D-RB 3).

To be more specific, D-RB 1 is formed with subcarriers f₁, f₁₀ and f₁₉,D-RB 2 is formed with subcarriers f₂, f₁₁ and f₂₀, D-RB 3 is formed withsubcarriers f₃, f₁₂ and f₂₁, D-RB 4 is formed with subcarriers f₄, f₁₃and f₂₂, D-RB 5 is formed with subcarriers f₅, f₁₄ and f₂₃, D-RB 6 isformed with subcarriers f₆, f₁₅ and f₂₄, and, L-RB 1 is formed withsubcarriers f₇ to f₉, L-RB 2 is formed with subcarriers f₁₆ to f₁₈, and,L-RB 3 is formed with subcarriers f₂₅ to f₂₇.

In RB configuration as such, as in allocation example 3, allocatingsection 102 allocates SCCH #A for mobile station #A to subcarriers f₁,f₄, f₇, f₁₂, f₁₅, f₁₈, f₂₀, f₂₃ and f₂₆, SCCH #B for mobile station #Bto subcarriers f₂, f₅, f₈, f₁₀, f₁₃, f₁₆, f₂₁, f₂₄, and f₂₇, and SCCH #Cfor mobile station #C to subcarriers f₃, f₆, f₉, f₁₁, f₁₄, f₁₇, f₁₉, f₂₂and f₂₅. That is, according to the configuration of D-RBs, as inallocation example 3, allocating section 102 cyclically shifts in threesubband cycles the allocation pattern of SCCH #A to SCCH #C in eachsubband, makes the allocation pattern of SCCH #A to SCCH #C different inthree subband cycles between the subbands, and allocate SCCH #A to SCCH#C to subcarriers f₁ to f₂₇.

By adopting such an allocation, as in allocation example 3, thecombination of a plurality of SCCHs is the same in all of D-RB 1 to D-RB6 and L-RB 1 to L-RB 3, that is, the combination of SCCH #A, SCCH #B andSCCH #C. Consequently, even when D-RBs and L-RBs arefrequency-domain-multiplexed and interference that data channels receivefrom SCCHs varies per subframe due to the influence of SCCH transmissionpower control, it is possible to evenly allocate the SCCHs for mobilestations to the RBs and prevent degradation of accuracy of data channeladaptive control.

Further, the SCCH allocation is the same between allocation example 3(FIG. 5) and this allocation example (FIG. 6), so that, by adopting theSCCH allocations shown in FIGS. 5 and 6, it is possible to evenlyallocate the SCCHs for mobile stations to RBs, regardless of a magnituderelationship of the numbers of D-RBs and L-RBsfrequency-domain-multiplexed in each subframe.

SCCH ALLOCATION EXAMPLE 5 FIG. 7

It is possible to allocate a plurality of RBs for one mobile stationusing one SCCH, but, taking into account a delay requirement oftransmitting data, it is preferable to use the SCCHs of a half to aquarter numbers of the total number of RBs. In this case, the number ofSCCHs may be larger than the number of D-RBs in one subband.

Then, this allocation example will show a case where, in the RBconfiguration in which D-RBs and L-RBs are frequency-domain-multiplexed,the number of SCCHs (here, six of SCCH #A to SCCH #F) is larger than thenumber of D-RBs (here, three of D-RB 1 to D-RB 3) in one subband.Further, in this allocation example, the number of SCCHs is an integralmultiple of the number of D-RBs in one subband.

In RB configuration as such, allocating section 102 allocates SCCH #A toSCCH #F of mobile stations #A to #F as shown in FIG. 7. That is, as inallocation example 3, according to the configuration of D-RBs,allocating section 102 cyclically shifts in three subband cycles theallocation pattern of SCCH #A to SCCH #F in each subband, makes theallocation pattern of SCCH #A to SCCH #F different in three subbandcycles between the subbands, and allocate SCCH #A to SCCH #F to thesubcarriers. In this allocation example, the order of SCCH #A to SCCH #Fin each subband is cyclically shifted by two SCCHs in three subbandcycles.

By adopting such an allocation, the combination of a plurality of SCCHsis the same in all of D-RB 1 to D-RB 3 and L-RB 1 to L-RB 6, that is,the combination of SCCH #A to SCCH #F. Consequently, even when D-RBs andL-RBs are frequency-domain-multiplexed and the number of D-RBs is largerthan the number of L-RBs in one subframe and interference that datachannels receive from SCCHs varies per subframe due to the influence ofSCCH transmission power control, it is possible to evenly allocate theSCCHs for mobile stations to the RBs and prevent degradation of accuracyof data channel adaptive control.

SCCH ALLOCATION EXAMPLE 6 FIG. 8

This allocation example is a case where, in an RB configuration in whichD-RBs and L-RBs are frequency-domain-multiplexed, the number of SCCHs(here, four of SCCH #A to SCCH #D) is larger than the number of D-RBs(here, three of D-RB 1 to D-RB 3) in one subband, as in allocationexample 5. Further, in this allocation example, the number of SCCHs isnot an integral multiple of the number of D-RBs in one subband.

In RB configuration as such, allocating section 102 allocates SCCH #A toSCCH #D of mobile stations #A to #D as shown in FIG. 8. That is, as inallocation example 3, according to the configuration of D-RBs,allocating section 102 cyclically shifts in three subband cycles theallocation pattern of SCCH #A to SCCH #D in each subband, makes theallocation pattern of SCCH #A to SCCH #D different in three subbandcycles between the subbands, and allocate SCCH #A to SCCH #D to thesubcarriers. In this allocation example, the order of SCCH #A to SCCH #Din each subband is cyclically shifted by two SCCHs in three subbandcycles.

By adopting such an allocation, the combination of a plurality of SCCHsis the same in all of D-RB 1 to D-RB 3 and L-RB 1 to L-RB 6, that is,the combination of SCCH #A to SCCH #D. Consequently, even when D-RBs andL-RBs are frequency-domain-multiplexed and the number of D-RBs is largerthan the number of L-RBs in one subframe and interference that datachannels receive from SCCHs varies per subframe due to the influence ofSCCH transmission power control, it is possible to evenly allocate theSCCHs for mobile stations to the RBs and prevent degradation of accuracyof data channel adaptive control.

Further, as noted from allocation example 5 (FIG. 7) and this allocationexample (FIG. 8), regardless of whether or not the number of SCCHs is anintegral multiple of the number of D-RBs in one subband, it is possibleto evenly allocate the SCCHs for mobile stations to RBs.

SCCH ALLOCATION EXAMPLE 7 FIG. 9

This allocation example makes the SCCH allocation patterns differentbetween neighboring cells.

SCCH transmission power control is carried out based on received qualitymeasured in the past subframes, and therefore, if the interference thatSCCHs in one of neighboring cell receives from SCCHs in the other cellvaries every subframe and received quality of the SCCHs in one ofneighboring cell changes every subframe, upon transmission of controlinformation in one of neighboring cell, transmission power control usingcurrent accurate received quality information cannot be carried out.That is, the accuracy of SCCH transmission power control is degraded. Asa result, the SCCH error rate performances are degraded.

Then, in this allocation example, assuming that cell 1 and cell 2 areneighboring each other and FIG. 5 shows the allocation patterns in cell1, FIG. 9 shows the allocation patterns in cell 2. The allocationpatterns shown in FIG. 9 also follow allocation example 3. However, theSCCHs allocated to the same subcarriers are different between theallocation patterns in FIG. 5 and the allocation patterns in FIG. 9.

In this way, by making the SCCH allocation patterns different betweencell 1 and cell 2, in a case where SCCHs are transmitted at the sametiming in cell 1 and cell 2, that is, in an inter-base stationsynchronization system where transmission timings of a plurality of basestation are the same, it is possible to randomize interference betweenSCCHs in neighboring cells. Consequently, according to this allocationexample, it is possible to prevent degradation of accuracy of SCCHtransmission power control and prevent SCCH error rate performances fromdegrading. Further, in an inter-base station non-synchronization system,this allocation example provides the same effect as in allocationexample 3.

SCCH ALLOCATION EXAMPLE 8 FIGS. 10 and 11

The present allocation example is a case where a data channel in eachsubframe is formed with L-RBs alone and the SCCH allocation patterns perL-RB are made different between neighboring cells. To be more specific,L-RB 1 is formed with subcarriers f₁ to f₆, L-RB 2 is formed with subcarriers f₁₂, L-RB 3 is formed with subcarriers f₁₃ to f₁₈, L-RB 4 isformed with subcarriers f₁₉ to f₂₄, and L-RB 5 is formed withsubcarriers f₂₅ to f₃₀.

In all the following allocation examples, pilot symbol P is multiplexedat the beginning of the subframe at six-subcarrier intervals.

In the case of adopting the RB configuration, for example, in the casewhere cell 1 and cell 2 are neighboring each other, FIG. 10 shows theallocation patterns in cell 1 and FIG. 11 shows the allocation patternsin cell 2.

That is, as shown in FIG. 10, when pilot symbol P is allocated tosubcarriers f₁, f₇, f₁₃, f₁₉ and f₂₅, allocating section 102 of basestation 100 in cell 1 allocates SCCH #A for mobile station #A tosubcarriers f₂, f₈, f₁₄, f₂₀ and f₂₆, SCCH #B for mobile station #B tosubcarriers f₃, f₉, f₁₅, f₂₁ and f₂₇, SCCH #C for mobile station #C tosubcarriers f₄, f₁₀, f₁₆, f₂₂ and f₂₈, SCCH #D for mobile station #D tosubcarriers f₅, f₁₁, f₁₇, f₂₃ and f₂₉ and, SCCH #E for mobile station #Eto subcarriers f₆, f₁₂, f₁₈, f₂₄ and f₃₀. In this way, in cell 1, theallocation patterns per L-RB are the same in L-RB 1 to L-RB 5.

Meanwhile, as shown in FIG. 11, when pilot symbol P is allocated tosubcarriers f₁, f₇, f₁₃, f₁₉ and f₂₅, allocating section 102 of basestation 100 in cell 2 allocates SCCH #A for mobile station #A tosubcarriers f₂, f₁₁, f₁₅, f₂₄ and f₂₈, SCCH #B for mobile station #B tosubcarriers f₃, f₁₂, f₁₆, f₂₀, and f₂₉, SCCH #C for mobile station #C tosubcarriers f₄, f₈, f₁₇, f₂₁ and f₃₀, SCCH #D for mobile station #D tosubcarriers f₅, f₉, f₁₈, f₂₂ and f₂₆, and, SCCH #E for mobile station #Eto subcarriers f₆, f₁₀, f₁₄, f₂₃ and f₂₇. In this way, in cell 2, theallocation pattern of SCCH #A to SCCH #E in L-RB 1 is the same as incell 1 and the allocation pattern of SCCH #A to SCCH #E in L-RB 1 iscyclically shifted by two subcarriers every L-RB, and therefore theallocations of SCCH #A to SCCH #E are made different between the L-RBs.

That is, according to this allocation example, SCCH #A of cell 2receives interference from SCCH #A of cell 1 in L-RB 1, receivesinterference from SCCH #D of cell 1 in L-RB 2, receives interferencefrom SCCH #B of cell 1 in L-RB 3, receives interference from SCCH #E ofcell 1 in L-RB 4, and receives interference from SCCH #C of cell 1 inL-RB 5. That is, SCCH #A of cell 2 receives interference from SCCH #A toSCCH #E of cell 1.

Similarly, SCCH #B of cell 2 receives interference from SCCH #B of cell1 in L-RB 1, receives interference from SCCH #E of cell 1 in L-RB 2,receives interference from SCCH #C of cell 1 in L-RB 3, receivesinterference from SCCH #A of cell 1 in L-RB 4, and receives interferencefrom SCCH #D of cell 1 in L-RB 5. That is, SCCH #B of cell 2 alsoreceives interference from SCCH #A to SCCH #E in cell 1.

The same applies to the interference SCCH #C to SCCH #E of cell 2 andSCCH #A to SCCH #E of cell 1 receive.

That is, according to this allocation example, in an inter-base stationsynchronization system, only if the SCCH transmission power of SCCH #Ato SCCH #E of cells 1 and 2 individually vary, it is possible to makeinterference uniform between SCCHs in neighboring cells. Consequently,according to this allocation example, it is possible to preventdegradation of accuracy of SCCH transmission power control and preventSCCH error rate performances from degrading.

Further, according to this allocation example, the combination of theSCCHs is the same in all of L-RB 1 to L-RB 5 and the SCCHs for mobilestations are evenly allocated to RBs, so that, in an inter-base stationnon-synchronization system, this allocation example provides the sameeffect as in allocation example 1.

In cell 2, by cyclically shifting every L-RB the allocation pattern ofSCCH #A to SCCH #E in L-RB 1, the allocations of SCCH #A to SCCH #E aremade different between the L-RBs. However, the allocations of SCCH #A toSCCH #E between L-RBs may be made different by an allocation method thatdoes not rely upon the cyclic shift, and the above-describedcorrespondence may be applicable to the SCCHs between neighboring cells.

SCCH ALLOCATION EXAMPLE 9 FIGS. 12, 13 and 14

This allocation example differs in allocation example 8 in selecting anallocation pattern of the SCCHs per L-RB from a plurality ofpredetermined allocation patterns.

That is, in this allocation example, an allocation pattern of the SCCHsper L-RB is selected from patterns 1 to 5 shown in FIG. 12. Patterns 1to 5 are the allocation patterns on a per subband basis.

For example, as shown in FIG. 13, allocating section 102 of base station100 in cell 1 selects and allocates pattern 1 to L-RB 1, pattern 4 toL-RB 2, pattern 3 to L-RB 3, pattern 2 to L-RB 4, and pattern 5 to L-RB5. By this means, in cell 1, when pilot symbol P is allocated tosubcarriers f₁, f₇, f₁₃, f₁₉ and f₂₅, allocating section 102 allocatesSCCH #A for mobile station #A to subcarriers f₂, f₉, f₁₈, f₂₂ and f₂₉,SCCH #B for mobile station #B to subcarriers f₃, f₁₂, f₁₄, f₂₄ and f₂₈,SCCH #C for mobile station #C to subcarriers f₄, f₁₀, f₁₅, f₂₃ and f₂₆,SCCH #D for mobile station #D to subcarriers f₅, f₁₁, f₁₆, f₂₀ and f₂₇,and, SCCH #E for mobile station #E to subcarriers f₆, f₈, f₁₇, f₂₁ andf₃₀.

Meanwhile, as shown in FIG. 14, allocating section 102 of base station100 in cell 2 selects and allocates pattern 3 to L-RB 1, pattern 1 toL-RB 2, pattern 5 to L-RB 3, pattern 4 to L-RB 4, and pattern 2 to L-RB5. By this means, in cell 2, when pilot symbol P is allocated tosubcarriers f₁, f₇, f₁₃, f₁₉ and f₂₅, allocating section 102 allocatesSCCH #A for mobile station #A to subcarriers f₆, f₈, f₁₈, f₂₁ and f₂₈,SCCH #B for mobile station #B to subcarriers f₂, f₉, f₁₆, f₂₄ and f₃₀,SCCH #C for mobile station #C to subcarriers f₃, f₁₀, f₁₄, f₂₂ and f₂₉,SCCH #D for mobile station #D to subcarriers f₄, f₁₁, f₁₅, f₂₃ and f₂₆,and, SCCH #E for mobile station #E to subcarriers f₅, f₁₂, f₁₇, f₂₀ andf₂₇.

In this way, according to this allocation example, the SCCH allocationpatterns selected for the same L-RB are made different between cell 1and cell 2. That is, according to this allocation example, in aninter-base station synchronization system, it is possible to randomizeinterference between SCCHs in neighboring cells. Consequently, accordingto this allocation example, it is possible to prevent degradation ofaccuracy of SCCH transmission power control and prevent SCCH error rateperformances from degrading.

Further, in this allocation example, the selectable allocation patternsper L-RB are predetermined as patterns 1 to 5 shown in FIG. 12, so thatjust a simple process of selecting one of patterns 1 to 5 and allocatingthe selected pattern to L-RBs, makes it possible to randomizeinterference between SCCHs in neighboring cells.

Further, in this allocation example, the combination of SCCHs is thesame in all of patterns 1 to 5 shown in FIG. 12 and the SCCHs of mobilestations are evenly allocated to L-RBs, so that, in an inter-basestation non-synchronization system, this allocation example provides thesame effect as in allocation example 1.

In this allocation example, to further randomize, by changing thecorrespondence relationships between L-RB 1 to L-RB 5 and patterns 1 to5 on a per subframe basis, the allocation patterns for the L-RBs mayvary every subframe.

SCCH ALLOCATION EXAMPLE 10 FIGS. 15 and 16

This allocation example differs in allocation example 8 in thatsubcarriers where pilot symbol P is allocated are different betweenneighboring cells.

To be more specific, pilot symbol P of cell 1 is allocated tosubcarriers f₁, f₇, f₁₃, f₁₉ and f₂₅ as shown in FIG. 15. In contrast,pilot symbol P of cell 2 is allocated to subcarriers f₃, f₉, f₁₅, f₂₁and f₂₇ as shown in FIG. 16.

Then, as shown in FIG. 15, allocating section 102 of base station 100 incell 1 allocates SCCH #A for mobile station #A to subcarriers f₂, f₁₂,f₁₇, f₂₂ and f₂₇, SCCH #B for mobile station #B to subcarriers f₃, f₈,f₁₈, f₂₃ and f₂₈, SCCH #C for mobile station #C to subcarriers f₄, f₉,f₁₄, f₂₄ and f₂₉, SCCH #D for mobile station #D to subcarriers f₅, f₁₀,f₁₅, f₂₀ and f₃₀, SCCH #E for mobile station #E to subcarriers f₆, f₁₁,f₁₆, f₂₁ and f₂₆. As such, in cell 1, by cyclically shifting theallocation patterns of SCCH #A to SCCH #E of L-RB 1 by one subcarrier,the allocations of SCCH #A to SCCH #E are made different between theL-RBs.

Meanwhile as shown in FIG. 16, allocating section 102 of base station100 in cell 2 allocates SCCH #A for mobile station #A to subcarriers f₁,f₁₁, f₁₄, f₂₄ and f₂₈, SCCH #B for mobile station #B to subcarriers f₂,f₁₂, f₁₆, f₁₉ and f₂₉, SCCH #C for mobile station #C to subcarriers f₄,f₇, f₁₇, f₂₀ and f₃₀, SCCH #D for mobile station #D to subcarriers f₅,f₈, f₁₈, f₂₂ and f₂₅, SCCH #E for mobile station #E to subcarriers f₆,f₁₀, f₁₃, f₂₃ and f₂₆. As such, in cell 2, by cyclically shifting theallocation patterns of SCCH #A to SCCH #E of L-RB 1 by two subcarriers,the allocations of SCCH #A to SCCH #E are made different between theL-RBs.

In this way, according to this allocation example, the allocationpatterns of SCCHs per L-RB are different between neighboring cells, sothat, in an inter-base station synchronization system, it is possible torandomize interference between SCCHs in neighboring cells. Consequently,according to this allocation example, it is possible to prevent accuracyof SCCH transmission power control from degrading and prevent SCCH errorrate performances from degrading.

Further, according to this allocation example, pilot symbol P of cell 1receives interference from SCCH #A of cell 2 in L-RB 1, receivesinterference from SCCH #C of cell 2 in L-RB 2, receives interferencefrom SCCH #E of cell 2 in L-RB 3, receives interference from SCCH #B ofcell 2 in L-RB 4, and receives interference from SCCH #D of cell 2 inL-RB 5. That is, pilot symbol P of cell 1 receives interference fromSCCH #A to SCCH #E of cell 2.

Similarly, pilot symbol P of cell 2 receives interference from SCCH #Bof cell 2 in L-RB 1, receives interference from SCCH #C of cell 2 inL-RB 2, receives interference from SCCH #D of cell 2 in L-RB 3, receivesinterference from SCCH #E of cell 2 in L-RB 4, and receives interferencefrom SCCH #A of cell 2 in L-RB 5. That is, pilot symbol P of cell 2 alsoreceives interference from SCCH #A to SCCH #E of cell 1.

That is, according to this allocation example, in an inter-base stationsynchronization system, only if the SCCH transmission power of SCCH #Ato SCCH #E of cells 1 and 2 vary individually, it is possible to makeuniform both interference that the pilot symbol in cell 1 receives fromthe SCCHs in cell 2 and interference that the pilot symbol in cell 2receives from the SCCHs in cell 1. Pilot symbols are used for channelestimation of SCCHs and data channels, and measurement of receivedquality at a mobile station and so on, so that, by making interferencepilot symbols receive uniform, it is possible to even out receptionperformance of SCCHs and data channels and improve accuracy of SCCHtransmission power control and data channel adaptive control.

Further, there are cases where pilot symbols are transmitted with hightransmission power for improved received quality. In this allocationexample, in cell 1, SCCH #B in L-RB 1, SCCH #C in L-RB 2, SCCH #D inL-RB 3, SCCH #E in L-RB 4, and SCCH #A in L-RB 5 receive interferencefrom pilot symbol P of cell 2, and, in cell 2, SCCH #A in L-RB 1, SCCH#C in L-RB 2, SCCH #E in L-RB 3, SCCH #B in L-RB 4, and SCCH #D in L-RB5 receive interference from pilot symbol P of cell 1. That is, accordingto this allocation example, interference that one SCCH receives frompilot symbols in a neighboring cell is made uniform, so that it ispossible to further improve SCCH error rate performances than inallocation example 8.

Further, according to this allocation example, the combination of SCCHsis the same in all of L-RB 1 to L-RB 5 and the SCCHs for mobile stationsare evenly allocated to the RBs, so that, in an inter-base stationnon-synchronization system, this allocation example provides the sameeffect as in allocation example 1.

Further, in this allocation example, the allocation of SCCH #A to SCCH#E is made different between L-RBs by cyclically shifting the allocationpattern of SCCH #A to SCCH #E in L-RB 1 every L-RB. However, theallocation of SCCH #A to SCCH #E between the L-RBs may be made differentby an allocation method that does not rely upon the cyclic shift, andthe above-described correspondence may be applicable to pilot symbols Pand the SCCHs between neighboring cells.

SCCH ALLOCATION EXAMPLE 11 FIGS. 17 and 18

This allocation example differs in allocation example 10 in selectingallocation patterns of SCCHs per L-RB from a plurality of predeterminedallocation patterns.

That is, in this allocation example, an allocation pattern of the SCCHsper L-RB in cell 1 is selected from patterns 1 to 5 shown in FIG. 12,and an allocation pattern of the SCCHs per L-RB in cell 2 is selectedfrom patterns 1 to 5 shown in FIG. 17. Patterns 1 to 5 are theallocation patterns on a per subband basis.

Assuming that the allocation patterns in cell 1 are as shown in FIG. 13,allocating section 102 of base station 100 in cell 2 selects andallocates pattern 3 to L-RB 1, pattern 1 to L-RB 2, pattern 5 to L-RB 3,pattern 4 to L-RB 4, and pattern 2 to L-RB 5 as shown in FIG. 18. Bythis means, in cell 2, when pilot symbol P is allocated to subcarriersf₃, f₉, f₁₅, f₂₁ and f₂₇, allocating section 102 allocates SCCH #A formobile station #A to sub carriers f₆, f₇, f₁₇, f₂₀ and f₂₈, SCCH #B formobile station #B to subcarriers f₁, f₈, f₁₆, f₂₄ and f₃₀, SCCH #C formobile station #C to subcarriers f₂, f₁₀, f₁₃, f₂₂ and f₂₉, SCCH #D formobile station #D to subcarriers f₄, f₁₁, f₁₄, f₂₃ and f₂₅, and, SCCH #Efor mobile station #E to subcarriers f₆, f₁₂, f₁₈, f₁₉ and f₂₆.

As such, according to this allocation example, selectable allocationpatterns per L-RB in cell 1 are predetermined as patterns 1 to 5 shownin FIG. 12 and selectable allocation patterns per L-RB in cell 2 arepredetermined as patterns 1 to 5 shown in FIG. 17, so that just a simpleprocess of selecting one of patterns 1 to 5 and allocating the selectedpattern to the L-RBs per cell, makes it possible to randomizeinterference between SCCHs in neighboring cells, even when subcarrierswhere pilot symbol P is allocated are different between neighboringcells.

Further, in this allocation example, the combination of SCCHs is thesame in all of patterns 1 to 5 shown in FIG. 12 and in all of patterns 1to 5 shown in FIG. 17, and the SCCHs for mobile stations are evenlyallocated to the L-RBs, so that, in an inter-base stationsynchronization system, this allocation example provides the same effectas in allocation example 1.

In this allocation example, to further randomize, by changing thecorrespondence relationships between L-RB 1 to L-RB 5 and patterns 1 to5 on a per subframe basis, the allocation patterns for the L-RBs mayvary every subframe.

SCCH ALLOCATION EXAMPLE 12 FIGS. 19 and 20

This allocation example is where the number of subcarriers in one L-RBdoes not match the pilot symbol intervals.

To be more specific, as shown in FIGS. 19 and 20, assuming that thenumber of subcarriers in one L-RB is twelve and the pilot symbolinterval is six subcarriers, in this allocation example, FIG. 19 showsthe allocation patterns in cell 1 and FIG. 20 shows the allocationpatterns in cell 2. That is, in this allocation example, there are twosubcarriers forming one SCCH in one L-RB.

In this way, according to this allocation example, the allocationpatterns of the SCCHs per L-RB are different between neighboring cells,so that, in an inter-base station synchronization system, it is possibleto randomize interference between SCCHs in neighboring cells.Consequently, according to this allocation example, even when the numberof subcarriers in one L-RB does not match pilot symbol intervals, it ispossible to prevent degradation of accuracy of SCCH transmission powercontrol and prevent SCCH error rate performances from degrading.

Further, according to this allocation example, the combination of SCCHsis the same in all of L-RB 1 to L-RB 3 and the SCCHs for mobile stationsare evenly allocated to the RBs, so that, in an inter-base stationnon-synchronization system, this allocation example provides the sameeffect as in allocation example 1.

Further, in this allocation example, the allocation patterns vary everyL-RB in cell 1 as shown in FIG. 19. In contrast, the allocation patternsvary between blocks of the pilot symbol interval in cell 2 as shown inFIG. 20. This makes it possible to further randomize interferencebetween SCCHs in neighboring cells.

It is equally possible to change the allocation patterns every L-RB inboth cell 1 and cell 2, and change the allocation patterns betweenblocks of the pilot symbol interval in both cell 1 and cell 2. Bychanging the allocation patterns between blocks of the pilot symbolinterval in both cell 1 and cell 2, it is possible to further reduceinterference given to pilot symbol P from neighboring cells.

SCCH ALLOCATION EXAMPLE 13 FIGS. 21

This allocation example is where the number of SCCHs transmitted islarger than the number of SCCHs allocatable in one L-RB, such as thenumber of SCCHs is larger than the number of subcarriers in one L-RB.

To be more specific, as shown in FIG. 21, assuming that the number ofSCCHs is ten of SCCH #A to SCCH #J, and the number of subcarriers in oneL-RB is five, in this allocation example, SCCH #A to SCCH #E areallocated to odd-numbered L-RBs, L-RB 1, L-RB 3 and L-RB 5, and SCCH #Fto SCCH #J are even-numbered L-RBs, L-RB 2, L-RB 4 and L-RB 6. By thismeans, the allocation pattern in the block formed with L-RB 1 and L-RB2, the allocation pattern in the block formed with L-RB 3 and L-RB 4 andthe allocation pattern in the block formed with L-RB 5 and L-RB 6 can bethe same.

In this way, according to this allocation example, the combinations ofSCCHs is the same every two L-RBs and the SCCHs for mobile stations areevenly allocated every two L-RBs, so that, even when the number of SCCHsis larger than the number of subcarriers in one L-RB in base station inan inter-base station non-synchronization system, allocation exampleprovides the same effect as in allocation example 1.

Further, by making the allocation patterns of SCCHs per L-RB differentbetween neighboring cells, even when the number of SCCHs is larger thanthe number of subcarriers per L-RB in an inter-base stationsynchronization system, it is possible to randomize interference betweenSCCHs in neighboring cells, so that it is possible to preventdegradation of accuracy of SCCH transmission power control and preventSCCH error rate performances from degrading.

In the odd-numbered L-RBs (i.e. the L-RBs where SCCH #A to SCCH #E areallocated) and the odd-numbered L-RBs (i.e. the L-RBs where SCCH #F toSCCH #J are allocated), the SCCH allocation patterns may be madedifferent between neighboring cells as in allocation example 8. Thisprovides the same effect as in allocation example 8.

In the odd-numbered L-RBs (i.e. the L-RBs where SCCH #A to SCCH #E areallocated) and the odd-numbered L-RBs (i.e. the L-RBs where SCCH #F toSCCH #J are allocated), allocation patterns of SCCHs may be selected asin allocation example 9. This provides the same effect as in allocationexample 9.

An embodiment of the present invention has been explained.

Although cases have been explained with the above allocation exampleswhere the SCCHs are evenly allocated to the RBs perfectly, the sameeffect may be provided if the SCCHs are evenly allocated to the RBsapproximately.

The subframes used with the above explanation may be other transmissiontime units including time slots and frames.

The RBs used with the above explanation may be other transmission unitsin the frequency domain including subcarrier blocks.

Further, a mobile station may be referred to as “UE,” base station maybe referred to as “Node-B,” and a subcarrier may be referred to as“tone.” Further, a subband may be referred to as a “subchannel”, a“subcarrier block,” or a “chunk.” Further, a CP may be referred to as a“guard interval (GI).” Further, an SCCH may be referred to as a “PDCCH(Physical Downlink Control Channel) or a “CCE (Control ChannelElement).” Further, a pilot symbol may be referred to as a “referencesignal.” Further, a resource unit formed with one subcarrier and oneOFDM symbol may be referred to as a “RE (Resource Element).” Further, asubband may be referred to as a “physical resource block (P-RB)” orsimply a “resource block (RB).”

Further, in the SCCH, uplink channel allocation information and controlsignals such as an Ack or a Nack besides a mobile station ID, an RBnumber, MCS information may be transmitted.

Further, although the SCCH has been explained with the above explanationas an example of channels where transmission power control is carriedout per mobile station, the present invention is not limited to this,and, the present invention is applicable to all channels wheretransmission power control is carried out per mobile station.

Further, although control information for one mobile station istransmitted in one SCCH in the above explanation, a plurality of mobilestations may be grouped and one SCCH is used per group. The transmissionpower control in this case is carried out according to the mobilestation of the lowest received quality in the group.

Further, although an example has been explained with the aboveexplanation, where the SCCH is allocated at the beginning of thesubframe, the SCCH may be allocated to the position that is not thebeginning of the subframe, for example, the second OFDM symbol of thesubframe. Furthermore, the SCCH may be allocated to a plurality of OFDMsymbols.

Further, although an example has been explained with the aboveexplanation where the SCCHs and data channels aretime-domain-multiplexed, the SCCHs and data channels may also befrequency-domain-multiplexed.

Further, although the transmission power control is carried out afterthe SCCHs are allocated to the subcarriers in the above explanation, theSCCHs may also be allocated to subcarriers after the transmission powercontrol for the SCCHs is carried out. That is, in FIG. 1, the positionof allocating section 102 and transmission power control section 103 maybe switched and transmission power control section 103 is set upstreamof allocating section 102.

Further, in 3GPP LTE (long term evolution), bandwidths in the system areset every resource block, so that, by determining the SCCH allocationpatterns every resource block as in the above allocation examples, it ispossible to manage various bandwidths in the system flexibly.

Further, although cases have been described with the above embodiment asexamples where the present invention is configured by hardware, thepresent invention can also be realized by software.

Each function block employed in the description of each of theaforementioned embodiments may typically be implemented as an LSIconstituted by an integrated circuit. These may be individual chips orpartially or totally contained on a single chip. “LSI” is adopted herebut this may also be referred to as “IC,” “system LSI,” “super LSI,” or“ultra LSI” depending on differing extents of integration.

Further, the method of circuit integration is not limited to LSIs, andimplementation using dedicated circuitry or general purpose processorsis also possible. After LSI manufacture, utilization of a programmableFPGA (Field Programmable Gate Array) or a reconfigurable processor whereconnections and settings of circuit cells within an LSI can bereconfigured is also possible.

Further, if integrated circuit technology comes out to replace LSIs as aresult of the advancement of semiconductor technology or a derivativeother technology, it is naturally also possible to carry out functionblock integration using this technology. Application of biotechnology isalso possible.

The disclosure of Japanese Patent Application No. 2006-223583, filed onAug. 18, 2006, and Japanese Patent Application No. 2007-104209, filed onApr. 11, 2007, including the specifications, drawings and abstracts, areincorporated herein by reference in their entirety.

INDUSTRIAL APPLICABILITY

The present invention is applicable to, for example, mobile stationcommunication systems.

The invention claimed is:
 1. An integrated circuit comprising circuitryconfigured to cause a communication apparatus to execute a process,wherein the process includes: receiving a control channel among aplurality of control channels, which are transmitted from a basestation, a plurality of subcarriers being divided into a plurality ofblocks, each of the plurality of control channels being distributedlymapped to at least two of the plurality of blocks, and a mapping patternof the plurality of control channels to one of the at least two of theplurality of blocks being different between from a mapping pattern ofthe plurality of control channels to the other of the at least two ofthe plurality of blocks; receiving data, which is transmitted from thebase station and mapped on at least one of the plurality of blocks; andtransmitting reception quality information to the base station.
 2. Theintegrated circuit according to claim 1, comprising: at least one inputcoupled to the circuitry, wherein the at least one input, in operation,inputs data; and at least one output coupled to the circuitry, whereinthe at least one output, in operation, outputs data.
 3. The integratedcircuit according to claim 1, wherein the plurality of control channelsare mapped such that a sequence of the plurality of control channels isdifferent between the at least two of the plurality of blocks.
 4. Theintegrated circuit according to claim 1, wherein the plurality ofcontrol channels are mapped such that a sequence of the plurality ofcontrol channels is different between cells.
 5. The integrated circuitaccording to claim 1, wherein the plurality of control channels aremapped to a symbol other than a first symbol in a subframe.
 6. Theintegrated circuit according to claim 1, wherein the plurality ofcontrol channels are mapped to blocks that are set to distributedresource block among the plurality of blocks.
 7. The integrated circuitaccording to claim 1, wherein the plurality of control channels aremapped such that the plurality of control channels are uniformlydistributed to the at least two of the plurality of blocks.
 8. Theintegrated circuit according to claim 1, wherein the plurality ofcontrol channels are mapped such that a combination of the plurality ofcontrol channels mapped to each of the at least two of the plurality ofblocks is same.
 9. The integrated circuit according to claim 1, whereinthe plurality of control channels are mapped such that a sequence of theplurality of control channels is cyclically shifted between the at leasttwo of the plurality of blocks.
 10. An integrated circuit comprisingcircuitry, which, in operation: controls reception of a control channelamong a plurality of control channels, which are transmitted from a basestation, a plurality of sub carriers being divided into a plurality ofblocks, each of the plurality of control channels being distributedlymapped to at least two of the plurality of blocks, and a mapping patternof the plurality of control channels to one of the at least two of theplurality of blocks being different between from a mapping pattern ofthe plurality of control channels to the other of the at least two ofthe plurality of blocks; controls reception of data, which istransmitted from the base station and mapped on at least one of theplurality of blocks; and controls transmission of reception qualityinformation to the base station.
 11. The integrated circuit according toclaim 10, comprising: at least one input coupled to the circuitry,wherein the at least one input, in operation, inputs data; and at leastone output coupled to the circuitry, wherein the at least one output, inoperation, outputs data.
 12. The integrated circuit according to claim10, wherein the plurality of control channels are mapped such that asequence of the plurality of control channels is different between theat least two of the plurality of blocks.
 13. The integrated circuitaccording to claim 10, wherein the plurality of control channels aremapped such that a sequence of the plurality of control channels isdifferent between cells.
 14. The integrated circuit according to claim10, wherein the plurality of control channels are mapped to a symbolother than a first symbol in a subframe.
 15. The integrated circuitaccording to claim 10, wherein the plurality of control channels aremapped to blocks that are set to distributed resource block among theplurality of blocks.
 16. The integrated circuit according to claim 10,wherein the plurality of control channels are mapped such that theplurality of control channels are uniformly distributed to the at leasttwo of the plurality of blocks.
 17. The integrated circuit according toclaim 10, wherein the plurality of control channels are mapped such thata combination of the plurality of control channels mapped to each of theat least two of the plurality of blocks is same.
 18. The integratedcircuit according to claim 10, wherein the plurality of control channelsare mapped such that a sequence of the plurality of control channels iscyclically shifted between the at least two of the plurality of blocks.